Common problems that occur during the use of ladle

Source: | Author:ChangXing Refractory | Published time: 1525 days ago | 1076 Views | Share:

1. The ladle replacement caused by the inability of argon blowing is often encountered. The replacement of the ladle will not only delay the smelting time, but the process of replacing the ladle will also bring safety problems. At the same time, it will also cause the molten steel to inhale during the ladle turning process and bring some inclusions. It increases the difficulty of smelting and adds a certain amount of smelting cost.
2. The slag line is corroded seriously, and the utilization rate of the slag line is low. Frequent replacement of the slag line will increase the smelting cost, and it is also not conducive to the normal progress of smelting. It is prone to leakage of molten steel and brings certain hidden dangers to production.
3. The ladle age is relatively short, and refractory bricks need to be replaced frequently.

Solution:

1. The air supply position of the air-permeable brick is changed from the original position close to the center to the current position 1/2R from the center of the bottom surface of the ladle. The slit width of the air-permeable brick is reasonably selected. After many practices, it has been proved that the slit width is the best when the slit width is 0.15mm. When it is less than 0.13mm, it is not easy to blow through, and when it is greater than 0.17mm, the steel slag is easy to penetrate into the working surface. At the same time, the length and number of slits are appropriately increased to increase the hot operation of the ladle. After the molten steel is poured, the surplus is returned in time, and the ladle is treated. For the remaining steel slag, strengthen supervision and check the ladle venting bricks before repair and installation, and it is not allowed to use unqualified venting bricks.
2. Ladle walls are first laid with 2 layers of asbestos boards with a thickness of 5mm, then one layer is wet-laid with clay bricks and clay powder, and baked for 8 hours. After cooling, use 1 to 3 grade magnesia carbon bricks or other better slag resistance. Refractory bricks and magnesia powder are dry-laid on the plane, and the facade is wet-laid with one layer. Fine masonry is required. The brick gap is ≤2mm. The final slag line can use 1 to 3 grade magnesia carbon bricks or other refractory bricks with better slag resistance. Above the slag line and above the slag line, use Class 1 magnesia-carbon bricks or other Class 1 refractory bricks with better slag resistance and special refractory mud for dry laying on the plane and wet laying on the facade. Special fine masonry is required, and the brick gap is ≤1mm.
3. Change the position of the breathable brick to a position 1/2R from the center of the bottom of the ladle, and after the slit width of the breathable brick is changed to 0.15mm, the ladle argon blowing rate has been improved, and the blowing rate has reached more than 95%. The slag line has been replaced from 3 to 4 times to 8 to 10 times.